Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Study on the Hydrogen Yield of $NaBH_4$ Hydrolysis Reaction

$NaBH_4$ 가수분해반응에서 수소 수율에 관한 연구

  • Hwang, Byungchan (Department of Chemical Engineering, Sunchon National University) ;
  • Jo, Jaeyoung (Department of Chemical Engineering, Sunchon National University) ;
  • Sin, Sukjae (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Choi, Daeki (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Nam, Sukwoo (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Park, Kwonpil (Department of Chemical Engineering, Sunchon National University)
  • 황병찬 (순천대학교 화학공학과) ;
  • 조재영 (순천대학교 화학공학과) ;
  • 신석재 (한국과학기술연구원 연료전지센터) ;
  • 최대기 (한국과학기술연구원 연료전지센터) ;
  • 남석우 (한국과학기술연구원 연료전지센터) ;
  • 박권필 (순천대학교 화학공학과)
  • Published : 2011.10.01
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Abstract

Sodium borohydride, $NaBH_4$, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs). The hydrogen yield of sodium borohydride hydrolysis reaction was studied. The effect of temperature, $NaBH_4$ concentration, NaOH concentration and catalyst type on the hydrogen yield from $NaBH_4$ hydrolysis reaction were measured. The catalysts of Co-P/Cu, Co-B/Cu and Co-P-B/Cu were used in this study and there was no different effect of these catalysts on the hydrogen yield from $NaBH_4$. Under the temperature of $60^{\circ}C$, the hydrogen yield decreased as $NaBH_4$ concentration increased due to formation of gel with by-products and reactants. The gel formed during $NaBH_4$ hydrolysis reaction diminished the hydrogen evolution rate and total volume of hydrogen. Addition of NaOH stabilizer enhanced the formation of gel and then decreased the hydrogen yield.

휴대용 고분자전해질 연료전지의 수소발생용으로써 $NaBH_4$는 많은 장점을 갖고 있다. 본 연구에서는 $NaBH_4$ 가수분해 반응의 수소 수율에 대해 연구하였다. $NaBH_4$ 가수분해 반응의 수소 수율에 미치는 촉매 형태, 온도, $NaBH_4$ 농도, NaOH 농도 등의 영향에 대해 실험하였다. 촉매는 Co-P/Cu, Co-B/Cu와 Co-P-B/Cu를 사용하였는데 이들 촉매 종류에 따라 $NaBH_4$ 가수분해 반응의 수소 수율에 미치는 영향은 거의 없었다. $60^{\circ}C$ 이하의 온도에서 $NaBH_4$ 농도가 증가하면 부산물과 $NaBH_4$에 의해 겔이 형성되면서 가수분해 반응의 수소 수율이 감소였다. 겔 형성에 의해서 $NaBH_4$ 가수분해 반응 속도와 수소 총 발생량이 감소하였다. 안정화제인 NaOH를 첨가하면 겔 형성을 촉진해 수소 수율을 감소시켰다.

Keywords

References

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